Adding EDTA to calcareous soil can increase the availability of zinc, which is important for growing nutrient-rich crops like winter wheat. The researchers found that applying EDTA to the soil led to a significant increase in zinc concentration in the wheat grains without affecting the yield. This increase was due to the transformation of unavailable zinc fractions in the soil to available ones, as well as enhanced uptake of zinc by the wheat plants. The study showed that EDTA application can improve zinc bioavailability in calcareous soil without changing the soil pH, making it a promising method for enhancing the nutritional quality of crops grown in such conditions.